There seems to be an odd distortion effect on 4* (Exceptional) scopes which makes them far worse from a visual quality perspective than 3* (Good) scopes.
So this is the view from a 3* scope (6-12), you can see (beyond some minor scratches) the view is clear
And this is the view from a 4* scope, where the middle of the view is distorted to almost cartoonish levels
This seems (to me) like the shader mask for the distortion layer on the 4* scope has been accidentally inverted (somewhere), so it’s applying the distortion to the center of the field of view instead of becoming progressive stronger at the edges of the view.
This is on Steam/PC [Latest version, with April hotfix]